Why is this happening now? Does this indicate a shifting trend away from veganism, or is this a totally normal pattern and it's just getting more attention right now? Basically: what is common between all of these announcements?

Blair white was vegan when she was 14 and quit wayy before her youtube career started at ages 21/22. She never made a pro-vegan "what I eat in a day as a vegan" video. Not sure she counts as YT's in this list
– Chillin'Jun 21 '19 at 9:28

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Part of the answer is how youtube works- youtubers need views, so they need to generate a story with change and drama. "Yup, still vegan and doing fine" isn't a story that is going to get views. Many response videos were "yup, still vegan" and they didn't get millions of views.

Many youtubers did response videos, I like Mic the Vegan's response videos. Unavoidably, trying to figure out what happened is a lot of speculation because the youtubers cite health issues, not necessarily supported by confirmation with doctors. Some of these health issues very plausibly relate to some of the extreme and unusal things they did, like drinking alcoline water to the point that it probably had an effect on their digestive system. That is just one person. Each youtuber that is prone to trying out extreme things did something different, fasts, eating just one food for a prolonged period of time, etc. The only pattern is that these are out of the ordinary practices and probably made for good stories. I don't think all of these youtubers set out to insincerely try a health fad for views, but when you get so many views that youtube starts paying your mortgage, I can understand how folk might naturally fall into doing crazy health stunts for the camera.

The purity goal may be harming the big picture goal less harm to animal. Melanie Joy of Beyond Carnism advocates "Sustainable Veganism". Do as much as you feel you can and sustain that.
– Mark StosbergJun 27 '19 at 17:58

This is what they do for a living.

Maybe slightly opinion-based, but some of the influencers you name were never vegan. They just followed and then abandoned a strictly plant-based diet the same way they followed other fad/trend-diets in the past.

A vegan diet is easy to stick to if you eat a low refined fat diet. The more refined fats and oils you eat, the more attention you need to pay to your protein intake and getting all the required amino-acids. On the long term, people can get fed up with all the hassle with having to get to a balanced diet if they never tried to get to a low fat, high carb diet. They may also get fed up with eating tofu, beans etc. at every meal.

Example: 2000 Kcal of whole grains yields all the required amino acids, despite whole grains being a so-called "incomplete protein". This is how I eat, I don't bother with vegan meat, tofu, beans etc. etc. It's all unnecessary once you get used to eating large volumes of whole grains, large volumes of potatoes, brown rice, nuts and seeds etc. and the 100 grams or more of fiber intake associated with that.

I believe in global shifting of human consciousness. I think the time is coming when the long hidden lies are being disclosed and debunked and people are naturally less and less able to live out of alignment with their inner truth.

Also, when something like this happens, it's like an avalanche. Events like this are not independently randomly distributed over time, rather, they tend to cluster :-)

JP Sears is a satirist. This answer is either satire (in which case, -1) or misinformed (in which case, -1).
– NicAug 31 '19 at 22:24

@Nic JP Sears is a satirist, but his videos are highly educational. The videos are fun, which doesn't mean they are just fun; he uses satire educatively to disclose and make people conscious all the "psychological" motives behind - which, many times, are hidden pretty deeply.
– TMSSep 2 '19 at 8:58